JP5330802B2 - Power storage device and vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a battery device having a gas exhausting function for exhausting gas generated from a battery element and a restraining function for restraining a battery pack. <P>SOLUTION: The battery device includes a battery stack 10 including the battery pack 12 which includes a plurality of battery elements 21 arranged in a prescribed direction and respectively provided with gas discharging valves 211 for discharging gas and the restraining member 41 restraining the battery pack 12 from a prescribed direction by being arranged along an outer surface of the battery stack 10 and connected to both end sections of the battery stack 10 in the prescribed direction. In this case, the restraining member 41 is formed like a tube and works as a gas exhausting section for exhausting the gas discharged from the gas discharging valves 211. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a power storage device and a vehicle including a power storage group in which a plurality of power storage elements are arranged in a predetermined direction.

  2. Description of the Related Art A power storage module in which a plurality of power storage elements are connected in series is known as a driving or auxiliary power source for electric vehicles, hybrid vehicles, and the like. Patent Document 1 discloses a power storage device that includes a battery module in which battery cells and a battery holder made of resin are stacked, and a restraining band that restrains the battery module to which a compressive force is applied in the stacking direction in the stacking direction. To do. The restraining band is formed in a plate shape, and is fixed to end plates provided at both ends of the battery module in the stacking direction.

  The battery holder has an exhaust gas flow path part. The exhaust gas flow path portion is formed so as to be hollow inside. The exhaust gas flow path part protrudes from the surface of each battery holder. The exhaust gas flow path portions of the battery holders are arranged so as to communicate with each other. The exhaust gas flow path portion extends along the stacking direction of the battery cells. An exhaust pipe is connected to the end portion of the exhaust gas flow path portion.

  Patent Document 2 discloses a storage battery device including a storage battery in which a plurality of cells are integrated, a gap is formed between the cells, and an opening is provided on the upper surface of the lid so as to communicate with the gap, and a duct cover provided with an exhaust mechanism. Is disclosed. The exhaust mechanism is disposed at the upper part of the opening. The duct cover includes a storage battery fixing holder.

Patent Document 3 is attached so as to block a secondary battery having positive and negative poles, a holder that holds at least the upper part of the secondary battery to form a sealed space therein, and a gas outlet of the holder. The present invention discloses a sealed secondary battery comprising a rubber duct for exhausting gas generated in the secondary battery, and a bus bar having one end connected to the pole and the other end protruding outward from the holder. . A bus bar seal portion for sealing the bus bar is integrally formed on the lid seal portion of the rubber duct.
JP 2008-16259 A JP 2004-55487 A JP 2004-227928 A

  However, in the configuration of Patent Document 1, since the exhaust gas flow path portion and the restraining band are arranged on the same surface of the laminate, the configuration becomes complicated and the cost is increased due to an increase in the number of parts.

  Accordingly, an object of the present invention is to provide a power storage device having a gas discharge function for discharging gas generated from a power storage element and a restraining function for restraining a power storage module at a low cost.

In order to solve the above-described problems, a power storage device according to the present invention includes (1) a power storage stack including a power storage group in which a plurality of power storage elements each having a valve for discharging gas are arranged in a predetermined direction; And a restraining member that restrains the electricity storage group from the predetermined direction by being disposed along an outer surface and connected to both ends of the electricity storage stack in the predetermined direction, and the restraining member is formed in a tubular shape. And also serves as a gas discharge part for discharging the gas discharged from the valve to the outside, and the restricting member is formed with an opening for communicating the valve and a space inside the restricting member, Has a pair of end plates that sandwich the power storage group compressed in the predetermined direction from the predetermined direction, and the restraining member is fixed to the pair of end plates, and the predetermined direction Placed between said power storage device adjacent to each other and is interposed an insulating plate, a bent portion obtained by bending a part of said plate, is interposed between the storage element and said restraining member, the bend portion, It has a plate opening extending along the surface on which the valve is formed of the outer surface of the electricity storage element, and communicating the valve and the space inside the restraining member .

( 2 ) In the configuration of ( 1) , the plate has an extending portion that extends between terminals of the power storage element adjacent in the predetermined direction. According to the configuration of ( 2 ), the insulation between the terminals adjacent to each other in a predetermined direction and the creepage distance between the bus bars connected to these terminals can be ensured to ensure the insulation.

( 3 ) In the configuration of (1) or ( 2 ), the power storage element includes a metallic element case and a pair of terminals formed on a terminal forming surface of the element case, and the valve includes the terminal It can form in the area | region pinched | interposed into a pair of said terminal in an installation surface.

( 4 ) In the configuration of ( 3 ), it has a bus bar that electrically connects the terminals of the adjacent power storage elements, and the bus bar is formed in a step shape including an upper step portion and a lower step portion, and the upper step portion Is provided at a position farther from the terminal forming surface than the restraining member, and a cooling passage through which cooling air flows is formed along the upper portion. According to the configuration of ( 4 ), since the cooling passage is formed at a position avoiding the restraining member, the bus bar can be reliably cooled. Further, by cooling the bus bar, the power generation element of the power storage element can be reliably cooled.

( 5 ) In the configuration of ( 4 ), a fin is provided in the upper stage portion. According to the configuration of ( 5 ), the heat radiation area of the bus bar can be increased.

( 6 ) In the configurations of (1) to ( 5 ), the restraining member can be made of metal. According to the configuration of ( 6 ), it is possible to more reliably suppress the decrease in the compressive force in a predetermined direction applied to the power storage group, and to withstand the high temperature gas discharged when the power storage element is abnormal.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical storage apparatus provided with the gas discharge function which discharges | emits the gas generated from an electrical storage element, and the restraint function which restrains an electrical storage group can be provided at low cost.

Examples of the present invention will be described below.
Example 1
With reference to FIGS. 1 and 2, a schematic configuration of a power storage device according to an embodiment of the present invention will be described. FIG. 1 is a plan view of the power storage device, in which a restraining member is omitted. FIG. 2 is a plan view of the power storage device and illustrates the restraint member without omitting it. The X axis, the Y axis, and the Z axis indicate three different axes that are orthogonal to each other.

  The battery stack (electric storage stack) 10 includes assembled batteries (electric storage group) 12A and 12B arranged side by side in the Y-axis direction, and end plates 13 arranged at both ends of these assembled batteries 12A and 12B in the X-axis direction. Including. In the following description, when it is not necessary to distinguish the assembled batteries 12A and 12B, they are referred to as the assembled battery 12.

  The assembled battery 12 </ b> A is configured by stacking a plurality of power storage elements 21 in the X-axis direction via plates 31. The plate 31 has a flat plate shape and is made of an insulating material. Therefore, a short circuit can be prevented by interposing the plate 31 between the adjacent power storage elements 21. The direction in which the power storage elements 21 are stacked, that is, the X-axis direction corresponds to a “predetermined direction” described in the claims.

  Each power storage element 21 is provided with a gas release valve 211. In FIG. 2, the gas release valve 211 is not shown because it is covered with the restraining member 41. The assembled battery 12 is sandwiched between a pair of end plates 13 while being compressed in the X-axis direction. The restraining member 41 is attached to the pair of end plates 13. Thereby, the space | interval of a pair of end plate 13 which receives reaction force in the direction which mutually separates from the assembled battery 12 is maintainable. Therefore, a decrease in compressive force applied to the assembled battery 12 can be suppressed.

  According to the above configuration, the performance of the assembled battery 12 can be maintained. Further, when the battery stack 10 vibrates due to vehicle travel, it is possible to suppress the storage element 21 from sliding in the YZ plane direction.

  The restraining member 41 is formed in a tube shape (see FIG. 3), and is disposed along the outer surface of the battery stack 10 so as to cover the gas release valve 211 when viewed in the Z-axis direction. Although details will be described later, the gas release valve 211 communicates with the internal space of the restraint member 41 and discharges the gas released from the gas release valve 211 to the outside of the vehicle via the restraint member 41. Can do.

  That is, according to the configuration of the present embodiment, the battery stack 10 can be restrained, the gas generated from the power storage element 21 can be discharged to the outside of the vehicle, and these two functions can be shared by the restraining member 41. Thereby, the number of parts can be reduced and the cost can be reduced.

  Next, the configuration of each part of the power storage device will be described in detail with reference to FIGS. FIG. 3 is a cross-sectional view of the power storage device taken along the Y1-Y2 plane. However, for ease of explanation, the plate 31 is projected and shown in a sectional view. FIG. 4 is a perspective view schematically showing the storage element and the plate.

  The power storage element 21 includes an element case 212 and a pair of terminal electrodes 213 formed on the terminal formation surface 212 </ b> A of the element case 212. The terminal electrode 213 is formed in a convex shape. A gas release valve 211 is formed in a region between the pair of terminal electrodes 213 on the terminal formation surface 212A. The gas release valve 211 is formed by partially reducing the thickness of the element case 212 (thickness in the Z-axis direction). Specifically, the gas release valve 211 (in other words, a destructive valve) can be formed by punching the element case 212. However, the gas release valve 211 may be a spring-type automatic return valve. Here, the spraying type automatic return valve includes a spring, a gas discharge port formed in the element case 212, and a valve that closes the gas discharge port and is connected to the spring. When the internal pressure of the element case 212 rises, the valve is released from the gas discharge port against the spring force of the spring, and the gas can be discharged outside the element case 212. When the increase in internal pressure is subsided, the valve released from the gas discharge port returns to the gas discharge port by the spring force of the spring.

  The element case 212 is formed in a so-called square shape. A power generation element (not shown) is accommodated in the element case 212. The power generation element is electrically connected to the conductive plate 214. The conductive plate 214 is formed in a so-called staircase shape, and includes an upper step portion 214A, a lower step portion 214B, and an intermediate portion 214C connecting the upper step portion 214A and the lower step portion 214B.

  The upper step portion 214A, the lower step portion 214B, and the intermediate portion 214C are integrally formed. A through-opening (not shown) is formed in the upper step portion 214A of the conductive plate 214. The terminal electrode 213 is inserted through the through opening of the upper step portion 214A. As a result, the terminal electrode 213 is electrically and mechanically connected to the conductive plate 214. The storage element 21 can be a secondary battery such as a lithium ion battery or a nickel metal hydride battery, or an electric double layer capacitor.

  The storage elements 21 adjacent in the Y-axis direction are connected in series by a first bus bar 22. The first bus bar 22 includes a lower step portion 221, an upper step portion 222, a lower step portion 221, an intermediate portion 224 that connects the upper step portion 222, and a radiation fin 223. The lower end 221 has a through opening (not shown). The terminal electrode 213 is inserted through this through opening. A flat radiating fin 223 is formed on the upper step 222 of the first bus bar 22. The radiation fin 223 extends in the Y-axis direction.

  By providing the heat dissipating fins 223, the heat dissipating area of the first bus bar 22 can be increased. The upper stage part 222 is located above the lower stage part 221. The lower step part 221, the upper step part 222, and the radiation fin 223 are integrally formed by press molding, extrusion molding, casting, or the like. The radiating fins 223 can be joined to the upper stage portion 222 by means such as brazing or welding.

  For the first bus bar 22, a material that is stable in the atmosphere in which the power storage device is disposed and that has excellent electrical conductivity and thermal conductivity can be used. For example, copper, aluminum, stainless steel, or a copper alloy can be used.

  The battery stack 10 of this embodiment is cooled by a cooling device (not shown). The arrows in FIGS. 1, 2 and 3 indicate the direction in which cooling air (hereinafter referred to as cooling air) flows. The cooling air is supplied from a chamber (not shown). Here, the terminal electrode 213 is positioned at substantially the same height as the restraining member 41. Therefore, the restraining member 41 becomes a barrier, and the terminal electrode 213 cannot be directly cooled by the cooling air. Therefore, in the present embodiment, the upper stage portion 222 of the first bus bar 22 is disposed above the restraining member 41. Thereby, the upper stage part 222 and the radiation fin 223 formed in the upper stage part 222 can be directly cooled by the cooling air.

  By cooling the first bus bar 22, the terminal electrode 213 connected to the first bus bar 22 can be cooled. By cooling the terminal electrode 213, the conductive plate 214 connected to the terminal electrode 213 can be cooled. By cooling the conductive plate 214, the power generation element housed in the element case 212 can be cooled. Therefore, it is possible to suppress the deterioration of the power storage element 21.

  A screw groove is formed on the outer peripheral surface of the terminal electrode 213. A fixing bolt 215 is fastened to the terminal electrode 213. By fastening the fixing bolt 215 to the terminal electrode 213, the first bus bar 22 and the conductive plate 214 can be fixed.

  The power storage elements 21 adjacent in the X-axis direction are connected in series by the second bus bar 23. The second bus bar 23 includes a lower part 231, an intermediate part 232, and an upper part 233. A through opening (not shown) is formed in the lower step portion 231. The terminal electrode 213 is inserted through this through opening. The intermediate portion 232 extends in the vertical direction (Z-axis direction) and is located between the lower step portion 231 and the upper step portion 233. The upper stage 233 is set to have a larger dimension in the X-axis direction than the lower stage 231.

  The upper stage part 233 is located above the lower stage part 231. A plurality of heat radiation fins 234 extending in the Y-axis direction are formed on the upper stage portion 233 of the second bus bar 23. These radiating fins 234 are formed at a predetermined interval in the X-axis direction. In addition, the lower step part 231, the intermediate part 232, the upper step part 233, and the radiation fin 234 are integrally formed by press molding, extrusion molding, casting, or the like. In addition, you may join the radiation fin 234 with respect to the upper step part 233 by means, such as brazing and welding.

  For the second bus bar 23, a material that is stable in the atmosphere in which the power storage device is disposed and that is excellent in electrical conductivity and thermal conductivity can be used. For example, copper, aluminum, stainless steel, or a copper alloy can be used.

Here, since the temperature of the cooling air rises by cooling the power storage element 21, the cooling capacity decreases as it goes downstream. The second bus bar 23 located on the downstream side is set to have a longer dimension in the Y-axis direction of the radiation fins 234 than the second bus bar 23 located on the upstream side. Thereby, the dispersion | variation in the cooling efficiency between the electrical storage elements 21 can be suppressed in the moving direction of cooling air.

The upper portion 233 of the second bus bar 23 is positioned above the restraining member 41 and the terminal electrode 213. As a result, the upper stage 233 and the radiation fins 234 formed on the upper stage 233 can be directly cooled by the cooling air.

By cooling the second bus bar 23, the terminal electrode 213 connected to the second bus bar 23 can be cooled. The terminal electrode 213 is cooled to cool the terminal electrode 213.
The conductive plate 214 connected to can be cooled. By cooling the conductive plate 214, the power generation element housed in the element case 212 can be cooled. Thereby, deterioration of the electrical storage element 21 can be suppressed.

A partition plate 51 is provided between the power storage elements 21 adjacent in the Y-axis direction. Partition plate 51
Is made of an insulating material. Thereby, the short circuit of the electrical storage element 21 adjacent to a Y-axis direction can be prevented.

Next, with reference to FIG.3 and FIG.4, the plate 31 arrange | positioned between the electrical storage elements 21 adjacent to a X-axis direction is demonstrated in detail. Referring to FIG. 4, the plate 31 includes a bus bar partition part (extension part) 311, a restraining member installation part (bending part) 312, and a plate body part 313. The plate main body 313 is in contact with the outer surface of the element case 212 of the electricity storage element 21. Thereby, since the electrical storage elements 21 adjacent in the X-axis direction are prohibited from contacting each other by the insulating plate 31, it is possible to prevent a short circuit.

The bus bar partition part 311 extends from the plate body part 313. Busbar partition 3
11 faces the terminal electrode 213 in the X-axis direction. According to the bus bar partitioning section 311, the first bus bar 22 (second bus bar 23) adjacent in the X-axis direction can be prevented from contacting each other when the first bus bar 22 (second bus bar 23) is attached. . Thereby, it can prevent that the electrical storage element 21 short-circuits. Further, according to the bus bar partitioning section 311, it is possible to prevent the first bus bars 22 (second bus bars 23) adjacent in the X-axis direction from contacting each other when vibration is applied to the power storage device.

  The restraining member installation portion 312 is located between the pair of terminal electrodes 213 when viewed in the X-axis direction. As shown in FIG. 4, the restraining member installation portion 312 is used by being bent in the direction of the arrow. The bent restraint member mounting portion 312 is in contact with the terminal forming surface 212 </ b> A of the element case 212. The folded state is shown in FIGS. The restraining member installation portion 312 is formed with a notch (plate opening) 312A. The notch 312A is formed at a position corresponding to the gas release valve 211. As shown in FIGS. 1 and 2, the gas released from the gas release valve 211 can be discharged from the notch 312A. .

  Further, the dimensions of the restraining member installation portion 312 in the X-axis direction are set in the same manner as the element case 212. Therefore, the region sandwiched between the pair of terminal electrodes 213 in the terminal formation surface 212A is covered by the restraining member installation portion 312, that is, a part of the plate 31 (except for the region where the gas release valve 211 is formed). .

  Here, the plate 31 can be formed by punching. Therefore, since it is not necessary to perform injection molding, the cost can be reduced. That is, as in Example 2 described later, when a resin frame is disposed between power storage elements adjacent in the X-axis direction, the resin frame must be injection molded. On the other hand, in the present embodiment, the plate 31 can be formed by punching, so that the cost can be reduced.

  The plate 31 can be made of an electrically insulating material such as resin. Specifically, polypropylene (polypropylene), a polypropylene polymer, a phenol resin, and an epoxy resin can be used.

  A restraint member 41 having a hollow structure is placed on the restraint member installation portion 312. The restraining member 41 has a substantially U-shaped cross section in the YZ plane direction, and an opening 411 is formed at the lower end thereof. The opening 411 of the restraint member 41 faces the gas release valve 211, and the gas released from the gas release valve 211 flows into the restraint member 41 through the opening 411.

  The restraining member 41 is made of metal. Specifically, SUS, Fe, Al, or the like can be used. Thus, by constituting the restraint member 41 with metal, it is possible to prevent the restraint member 41 from being melted by the high-temperature gas released from the gas release valve 211. Further, since the insulating plate 31 (restraining member placement portion 312) is interposed between the restraining member 41 and the element case 212, the restraining member 41 made of metal and the storage element 21 are in contact with each other. Therefore, it is possible to prevent a short circuit.

  Both end portions of the restraining member 41 are fixed to the end plate 13. The assembled battery 12 is sandwiched between a pair of end plates 13 while being compressed in the X-axis direction. Therefore, the pair of end plates 13 receives an external force from the assembled battery 12 in the direction in which they are separated. By configuring the restraining member 41 of metal, the distance between the pair of end plates 13 can be maintained against the external force applied from the assembled battery 12. Thereby, the pressurization state of the assembled battery 12 can be maintained, and the performance of each electrical storage element 21 can be maintained.

As described above, according to the present embodiment, the gap between the pair of end plates 13 is maintained to suppress a decrease in the compression force of the assembled battery 12, the gas generated from the power storage element 21 is discharged outside the vehicle, These two functions can be shared by the restraining member 41. Thereby, it is not necessary to provide a restraining member and a gas discharge pipe separately, and the number of parts and cost can be reduced.
(Example 2)
In the above-described embodiment, the insulating plate is interposed between the adjacent power storage elements. However, the present invention is not limited to this, and the insulating plate can be omitted. With reference to FIGS. 5 and 6, the power storage device of Example 2 will be described. FIG. 5 is an exploded perspective view of a part of the power storage device according to the second embodiment. FIG. 6 is an assembly diagram of the power storage device.

  The battery stack (electric storage stack) 50 includes assembled batteries (electric storage group) 52A and 52B arranged side by side in the Y-axis direction, and end plates 53 arranged at both ends in the X-axis direction of these assembled batteries 52A and 52B. Including. The direction in which the power storage group is configured, that is, the X-axis direction corresponds to a “predetermined direction” recited in the claims. In the following description, the assembled batteries 52A and 52B are collectively referred to as an assembled battery 52 when it is not necessary to distinguish them.

  Each of the assembled batteries 52A and 52B includes a plurality of power storage elements 61, and these power storage elements 61 are arranged side by side in the X-axis direction. The power storage element 61 includes an element case 612 and a pair of terminal electrodes 613 formed on the terminal formation surface 612A of the element case 612. The terminal electrode 613 is formed in a convex shape. In a region sandwiched between the pair of terminal electrodes 613 on the terminal formation surface 612A, a destructive gas release valve 611 is formed.

  The element case 612 is formed in a so-called square shape. A power generation element (not shown) is accommodated in the element case 612. The terminal electrode 613 and the power generation element are connected by a conductive means (not shown).

  A spacer member 71 is disposed between the power storage elements 61 adjacent in the X-axis direction. The spacer member 71 is made of resin. A plurality of protrusions 711 extending in the Y-axis direction are formed on both end surfaces of the spacer member 71 in the X-axis direction. These protrusions 711 are formed at a predetermined interval in the Z-axis direction.

  The protrusion 711 of the spacer member 71 is in contact with the outer surface of the element case 612 of the power storage element 61. A space between the protrusions 711 adjacent in the Z-axis direction becomes a cooling passage through which the cooling air moves. That is, the cooling air flows in the Y-axis direction through this cooling passage. Note that the cooling passage of this embodiment is not included in the cooling passage according to claim 8.

  A large number of ribs 531 extending in the X-axis direction are formed on the end plate 53. These ribs 531 can increase the heat radiation area of the end plate 53. As shown in FIG. 6, a restraining member 81 is placed in a region between the pair of terminal electrodes 613 on the terminal forming surface 612. Both ends of the restraining member 81 are fixed to the pair of end plates 53.

  The restraining member 81 has the same configuration as the restraining member 41 of the first embodiment, but is different from the restraining member 41 in that an insulating layer is provided on the surface. Therefore, even if the restraining member 81 is directly placed on the terminal forming surface 612, a battery short circuit does not occur.

  The restraining member 81 is disposed so as to cover the gas release valve 611 formed on the terminal forming surface 612A, as in the first embodiment. Therefore, the gas released from the gas release valve 611 can be discharged outside the vehicle via the restraining member 81.

  The assembled battery 52 is sandwiched between a pair of end plates 53 in a state compressed in the X-axis direction. For this reason, a load is applied to the pair of end plates 53 from the assembled battery 51 in a direction to separate them. By configuring the restraining member 81 of metal, the distance between the pair of end plates 53 can be maintained against the load received from the assembled battery 52. Thereby, the pressurization state of the assembled battery 52 can be maintained, and the performance of each electrical storage element 51 can be maintained.

  As described above, according to this embodiment, the gap between the pair of end plates 53 is maintained to suppress a decrease in the compressive force applied to the assembled battery 52, the gas generated from the power storage element 61 is discharged outside the vehicle, These two functions can be shared by the restraining member 81. Thereby, it is not necessary to provide a restraining member and a gas discharge pipe separately, and the number of parts and cost can be reduced.

(Modification 1)
In the above-described embodiment, the cross-sectional shape of the restraining members 41 and 81 is rectangular. However, the shape is not limited to this, and other shapes may be used. 7A and 7B are modified examples of the restraining member. The constraint member 91 of the modification has a circular cross-sectional shape in the YZ plane direction. A plurality of gas inlets (openings) 911 are formed on the outer surface of the restraining member 91. These gas inlets 911 are formed at a predetermined interval in the X-axis direction. The interval between adjacent gas inlets 911 is set to be the same as the interval between adjacent gas release valves (211 and 611).

  In other words, the shape of the restraining member of the present invention is not limited as long as it can be restrained in a state where the assembled battery is compressed in the stacking direction of the power storage elements and has a discharge space that can discharge the gas released from the power storage elements. Make it not exist.

  In the above-described embodiment, the restraining members 41 and 81 are made of metal. However, the present invention is not limited to this, and the reduction of the compressive force applied to the assembled battery is suppressed, and the gas released from the storage element is reduced. If the discharge space which can discharge | emit can be formed, it can also comprise with materials other than a metal.

  Moreover, although the plate 31 of Example 1 was comprised with the insulating material, the surface of the plate 31 may be comprised with an insulating material, and the other part may be comprised with a non-insulating material.

FIG. 3 is a plan view of the power storage device, with a restraining member (tubular member) omitted. It is a top view of an electrical storage apparatus, and has illustrated without restricting a member. It is sectional drawing when an electrical storage apparatus is cut | disconnected by the Y1-Y2 surface. It is the perspective view which simplified and illustrated the electrical storage element and the plate. It is the perspective view which decomposed | disassembled and illustrated a part of electrical storage apparatus of Example 2. FIG. It is an assembly drawing of a power storage device. It is sectional drawing of the restraint member of a modification. It is a top view of the restricting member of a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Battery stack 12 52 Assembly battery 21 Electric storage element 211,611 Gas release valve 41,81 Restraint member

Claims (7)

A power storage stack including a power storage group in which a plurality of power storage elements each having a valve for releasing gas are arranged in a predetermined direction; and
A restraining member that is disposed along the outer surface of the electricity storage stack and is connected to both ends of the electricity storage stack in the predetermined direction, and restrains the electricity storage group from the predetermined direction;
The constraining member is formed in a tubular shape, and also serves as a gas discharge unit that discharges gas released from the valve to the outside. The constraining member allows the valve and a space inside the constraining member to communicate with each other. An opening is formed,
The power storage stack has a pair of end plates that sandwich the power storage group compressed in the predetermined direction from the predetermined direction, and the restraining member is fixed to the pair of end plates,
An insulating plate is interposed between the power storage elements adjacent in the predetermined direction, and a bent portion obtained by bending a part of the plate is interposed between the power storage element and the restraining member ;
The bent portion extends along a surface on which the valve is formed of the outer surface of the power storage element, and has a plate opening that communicates the valve with the space inside the restraining member. Power storage device. The power storage device according to claim 1, wherein the plate has an extending portion that extends between terminals of the power storage elements adjacent in the predetermined direction. The power storage element includes a metallic element case and a pair of terminals formed on a terminal forming surface of the element case,
The valve, a power storage device according to claim 1 or 2, characterized in that it is formed in a region sandwiched between a pair of the terminals in the terminal installation surface. A bus bar for electrically connecting terminals of the adjacent power storage elements; and the bus bar is formed in a step shape including an upper step portion and a lower step portion, and the upper step portion is formed with the terminal rather than the restraining member. 4. The power storage device according to claim 3 , wherein the power storage device is provided at a position separated from the surface, and a cooling passage through which cooling air flows is formed along the upper stage portion. The power storage device according to claim 4 , wherein a fin is provided in the upper stage portion. Power storage device according to any one of claims 1 to 5, characterized in that constitutes the restraint member with a metal. Vehicle equipped with a power storage device according to any one of claims 1 to 6.

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